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Markov information matrix-based accelerated life test load spectrum design method

A technology of Markov information and Markov matrix, applied in computing, computer components, special data processing applications, etc., can solve problems such as accelerated life tests of aviation hydraulic pumps, shorten test time and increase load level Effect

Active Publication Date: 2018-07-31
BEIJING QTCREATE TECH
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Problems solved by technology

In view of the closed policy adopted by foreign countries on my country's related technologies, we have no way of knowing how to design the accelerated life test profile of foreign aviation hydrauli

Method used

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  • Markov information matrix-based accelerated life test load spectrum design method
  • Markov information matrix-based accelerated life test load spectrum design method
  • Markov information matrix-based accelerated life test load spectrum design method

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Experimental program
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Effect test

Embodiment

[0060] Adopt the inventive method to the accelerated life test load spectrum design of certain model aviation hydraulic pump as follows:

[0061] First, the rated pressure of the pump is 21MPa, the rated speed is 4200rpm, and the flow rate of each grade is shown in Table 1.

[0062] Table 1 Flow demand table for each flight phase

[0063]

[0064] pass Figure 7 The SAE-AS19692B general test standard for aviation general-purpose hydraulic pumps shown, the statistics of the load switching frequency information on this type of hydraulic pump, and the statistics of the flight data of a certain flight, to obtain the duration information of each flight state, such as Figure 8 As shown, the Markov information matrix shown below can be finally obtained. According to the analysis of hydraulic system user flow demand, output matrix E.

[0065]

[0066]

[0067] Using the hidden Markov model, the conventional load spectrum of the hydraulic pump flow load changing with time ...

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Abstract

The invention discloses a Markov information matrix-based accelerated life test load spectrum design method, which is applied to the field of airborne equipment reliability. According to the method, loads of a mechanical product in an alternating stress are subjected to statistics by utilizing a Markov information matrix method, and the accumulative effect of the loads and the influence of switching impulse are considered at the same time. The problem of incapability of directly obtaining actual loads of an aero hydraulic pump and the like is solved by utilizing a Markov model. A flow load ofthe hydraulic pump is calculated. The design of an accelerated life test load spectrum is performed according to an accumulative damage theory. On the premise of not changing a failure mechanism of airborne equipment, the accelerated life test of the airborne equipment is realized, and a good acceleration effect is obtained.

Description

technical field [0001] The invention belongs to the field of aviation airborne equipment reliability, and in particular relates to a design method of accelerated life test load spectrum based on Markov information matrix. Background technique [0002] Modern aircraft require ultra-high reliability and long life. As the core component of the aircraft hydraulic system, aviation hydraulic pumps have stricter requirements than ordinary hydraulic system hydraulic pumps. The hydraulic pump provides high-pressure oil of up to 21-35MPa for the aircraft hydraulic system, which is used to drive the flight control surface or retract the landing gear, etc. Its structure is complex, powerful, and its life and reliability requirements are getting higher and higher. Once the hydraulic pump of the aircraft fails, it will cause the aircraft hydraulic system to work abnormally, and cause the aircraft to crash, which will bring huge economic losses and adverse social impact. Therefore, modern...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06K9/62
CPCG06F30/15G06F30/17G06F18/295
Inventor 王少萍马仲海张超孙旭
Owner BEIJING QTCREATE TECH
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